ECP ControlCo, LLC - 19 Dec 2024 SCHEDULE 13D/A Report for Custom Truck One Source, Inc. Common Stock (CTOS)

Filing manager
ECP ControlCo, LLC
Reporting owner
ECP ControlCo, LLC
Security
Custom Truck One Source, Inc. Common Stock
Beneficially owned shares
16,287,270 shares
Ownership signal CIK-linked ownership evidence from parsed SEC filings. 2 signals
Large-stake signal

Form

SCHEDULE 13D/A

Active or control-oriented beneficial ownership filing.

Ownership

7%

Beneficial ownership of this reported class.

Shares

16,287,270 shares

Shares beneficially owned as disclosed.

Event date

19 Dec 2024

Date tied to the ownership event or amendment.

Accepted by SEC

23 Dec 2024

EDGAR acceptance date.

How to read this large-stake filing
  • Schedule 13D/G filings focus on beneficial ownership stakes, not a full portfolio.
  • Compare this filing with the holder history and issuer page before treating the percentage as a current position.
  • Use amendments to understand whether the disclosed stake increased, decreased, or changed reporting status.
Class ownership
7%
Subject security Names, identifiers, and filing context for this profile. 2 source fields
Symbol
CTOS
Shares outstanding
232,675,286 shares
Source evidence Original filing metadata and source links for verification. 5 source fields
SEC form
SCHEDULE 13D/A
Accepted by SEC
23 Dec 2024, 20:20:52 UTC
Event date
19 Dec 2024
Next SEC filing
03 Feb 2025
Source filing
View source filing

Key filing fact

ECP ControlCo, LLC disclosed 7% ownership in Custom Truck One Source, Inc. Common Stock (CTOS) on 19 Dec 2024.

Key facts

  • ECP ControlCo, LLC filed SCHEDULE 13D/A for Custom Truck One Source, Inc. Common Stock (CTOS).
  • Disclosed ownership: 7%.
  • Date of event: 19 Dec 2024.

Change

  • No earlier schedule filing is available for direct comparison.
  • Current filing was accepted on 23 Dec 2024, 20:20.

Research use

  • This page turns one Schedule 13D/G filing into a quick large-stake read before the raw reporting-person rows.
  • Use the linked SEC filing as the source of truth for ownership percentages, shares, and reporting-party details.

Evidence

Backed by Schedule 13D/13G

Beneficial ownership values are sourced from the original SEC Schedule 13D/13G filing.

View source filing

Reporting persons

Disclosed reporting parties (15)

Names, ownership percentages, voting power, signatures, titles, and CIKs as disclosed in this Schedule 13D/G filing.

Name Ownership Shares owned Sole voting power Shared voting power Signature Title CIK
ECP ControlCo, LLC 7% 16,287,270 0 16,287,270 /s/ Rahman D'Argenio Rahman D'Argenio Managing Member 0001707921
Energy Capital Partners III, LLC 7% 16,287,270 0 16,287,270 ECP ControlCo, LLC, its managing member /s/ Rahman D'Argenio Rahman D'Argenio Managing Member
Energy Capital Partners GP III, LP 7% 16,287,270 0 16,287,270 Energy Capital Partners III, LLC, its general partner ECP ControlCo, LLC, its managing member /s/ Rahman D'Argenio Rahman D'Argenio Managing Member
Energy Capital Partners III, LP 7% 16,287,270 0 16,287,270 Energy Capital Partners GP III, LP, its general partner Energy Capital Partners III, LLC, its general partner ECP ControlCo, LLC, its managing member Rahman D'Argenio Managing Member
Energy Capital Partners III-A, LP 7% 16,287,270 0 16,287,270 Energy Capital Partners GP III, LP, its general partner Energy Capital Partners III, LLC, its general partner ECP ControlCo, LLC, its managing member Rahman D'Argenio Managing Member
Energy Capital Partners III-B, LP 7% 16,287,270 0 16,287,270 Energy Capital Partners GP III, LP, its general partner Energy Capital Partners III, LLC, its general partner ECP ControlCo, LLC, its managing member Rahman D'Argenio Managing Member
Energy Capital Partners III-C, LP 7% 16,287,270 0 16,287,270 Energy Capital Partners GP III, LP, its general partner Energy Capital Partners III, LLC, its general partner ECP ControlCo, LLC, its managing member Rahman D'Argenio Managing Member
Energy Capital Partners III-D, LP 7% 16,287,270 0 16,287,270 Energy Capital Partners GP III, LP, its general partner Energy Capital Partners III, LLC, its general partner ECP ControlCo, LLC, its managing member Rahman D'Argenio Managing Member
Energy Capital Partners GP III Co-Investment (NESCO), LLC 7% 16,287,270 0 16,287,270 Energy Capital Partners III, LLC, its general partner ECP ControlCo, LLC, its managing member /s/ Rahman D'Argenio Rahman D'Argenio Managing Member
Energy Capital Partners III (NESCO Co-Invest), LP 7% 16,287,270 0 16,287,270 Energy Capital Partners GP III Co-Investment (NESCO), LLC Energy Capital Partners III, LLC, its general partner ECP ControlCo, LLC, its managing membe Rahman D'Argenio Managing Member
ECP Starlight Public GP, LLC 7% 16,287,270 0 16,287,270 /s/ Christopher M. Leininger Christopher M. Leininger Executive Vice President & General Counsel
ECP Starlight Guarantor (Public), LP 7% 16,287,270 0 16,287,270 ECP Starlight Public GP, LLC, its general partner /s/ Christopher M. Leininger Christopher M. Leininger Executive Vice President & General Counsel
NESCO Holdings GP, LLC 7% 16,287,270 0 16,287,270 /s/ Rahman D'Argenio Rahman D'Argenio President
NESCO Holdings, LP 5.8% 13,439,824 0 13,439,824 NESCO Holdings GP, LLC, its general partner /s/ Rahman D'Argenio Rahman D'Argenio President
ECP Cardinal Holdings, LP 1.2% 2,847,446 0 2,847,446 NESCO Holdings GP, LLC, its general partner /s/ Rahman D'Argenio Rahman D'Argenio President
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